How Do I Transfer My Entire Library To My Laptop?

I just got a laptop and I want to transfer all the music, movies, and tv shows that I have in itunes on my desktop computer. Hardly any of it was actually bought off of itunes, so I'm not sure how I go about transferring it. Does anyone know how I would go about moving it all?

Yeah I have a 320 gb external hard drive. I have 1180 songs, 30 movies, and 85 tv show episodes. If I could choose which to transfer over that would be great because there is some stuff I don't want on my laptop, but I don't want to delete it off of my desktop itunes. If not, that's alright.

I tried the ctrl + A method and it worked to transfer them to my HDD, and itunes recognizes them, but itunes always freezes up at determining gapless playback information. If I unplug the HDD then itunes instantly unfreezes, but most of the songs are missing their album artwork and they most have the little exclamation point next to the title and doesn't allow me to play them.